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- 저자 : 이응기(Eungki Lee) (검색결과 6 건)
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OLED 박막 증착공정에서 유도로 내부의 분자유동 해석
성재용(Jaeyong Sung),이응기(Eungki Lee) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Molecular flows inside a guide block in the OLED (organic luminescent emitting device) deposition process have been simulated using DSMC (direct simulation Monte Carlo) method. Because the organic materials are evaporated under vacuum, the molecules flow at a high Knudsen number of the free molecular regime, where the continuum mechanics is not valid. The guide block is designed as a part of the linear cell source to transport the evaporated materials to a deposition chamber. When solving the flows, the inlet boundary condition is proved to affect significantly the whole flow pattern. Thus, it is proposed that the pressure should be specified at the inlet. From the analysis of the density distributions at the nozzle exit of the guide block, it is shown that the longer nozzle can emit molecules more straightly. Finally, a nondimensionalized mass flow profile is obtained by the numerical experiments, where various nozzle widths and inlet pressures are tested.
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OLED 박막 증착공정에서 유도로 내부의 분자유동 해석
성재용(Jaeyong Sung),이응기(Eungki Lee) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Molecular flows inside a guide block in the OLED (organic luminescent emitting device) deposition process have been simulated using DSMC (direct simulation Monte Carlo) method. Because the organic materials are evaporated under vacuum, the molecules flow at a high Knudsen number of the free molecular regime, where the continuum mechanics is not valid. The guide block is designed as a part of the linear cell source to transport the evaporated materials to a deposition chamber. When solving the flows, the inlet boundary condition is proved to affect significantly the whole flow pattern. Thus, it is proposed that the pressure should be specified at the inlet. From the analysis of the density distributions at the nozzle exit of the guide block, it is shown that the longer nozzle can emit molecules more straightly. Finally, a nondimensionalized mass flow profile is obtained by the numerical experiments, where various nozzle widths and inlet pressures are tested.
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OLED 박막 증착공정에서 유도로 내부의 분자유동 해석
성재용(Jaeyong Sung),이응기(Eungki Lee) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.2
Molecular flows inside a guide block in the OLED(organic luminescent emitting device) deposition process have been simulated using DSMC(direct simulation Monte Carlo) method. Because the organic materials are evaporated under vacuum, molecules flow at a high Knudsen number of the free molecular regime, where the continuum mechanics is not valid. A guide block is designed as a part of the linear cell source to transport the evaporated materials to a deposition chamber. When solving the flows, the inlet boundary condition is proved to affect significantly the whole flow pattern. Thus, it is proposed that the pressure should be specified at the inlet. From the analysis of the density distributions at the nozzle exit of the guide block, it is shown that the longer nozzle can emit molecules more straightly. Finally, a nondimensionalized mass flow profile is obtained by numerical experiments, where various nozzle widths and inlet pressures are tested.
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칼럼의 자계렌즈 특성 분석을 위한 XYZ좌표이송 장치 설계, 제작 및 렌즈 특성 분석
인재준(Jaejun In),김준철(Junchul Kim),강진성(Jinsung Kang),이응기(Eungki Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Development of electron beam lithography needs to analyze of the electric field characteristics of the column lens. For analyzing the electric lens characteristics, it needs to measure the magnetic field distribution. It is needed to measure many points with high precision. Those reasons make us develop 3D magnetic field measuring system. Gauss-meter is installed on the end of y-axis of the developed system then it moves along X, Y, and Z axis and the Gauss-meter measures magnetic force at each position. The developed system is designed to have a counter weight balance against z-axis, such that it needs to reduce the actuation torque when Z axis moves to up and down. The magnetic field distribution data which measured by a Gauss-meter includes 3 directional vectors at each point. With the magnetic field measuring system, 3D magnetic field distribution profile is constituted. Then, the measured magnetic gradient was compared with the computer simulated one. It explains about a matter of the difference between the experimental data and the computer-simulated data.
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김민석(Minseok Kim),홍성철(Sungchul Hong),최재영(Jaeyoung Choi),이응기(Eungki Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Lately a car seat is vitally considered functional face as well as comfortableness. Accordingly shape of the seat is more complex and needs much time on design. Reverse engineering is that the technology can resolve this problem by generating CAD models from the physical mockups or prototype models. The coordinate measuring machine(CMM) if often used to acquire the surface information of the part, but is limited in its measuring direction, which is fixed only along the z-axis. Also, large product is difficult due to work space's limitation of CMM. Detected features of various shapes to supplement these problems in this paper. Mostly measured objects include referenced shapes like circles or quadrangles for the registration process. The detecting method of the feature can be comprehensively applied considering the accuracy of the registration regardless of the shape. This method can perform registration using the feature without additional tools.
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레이저 스캐너를 이용한 3차원 형상의 재구성을 위한 연구
이응기 公州大學校 工學硏究院 生産技術硏究所 2005 論文集 Vol.13 No.-
More complex geometric shapes, including freeform surfaces, are adopted for the design of products to emphasize styling or aesthetics. Modeling of these products is extremely difficult, and often impossible. Reverse engineering is as emerging technology that can resolve this problem by generating CAD models from the physical mockups or prototype models. The laser scanner if ofter used to acquire the surface information of the part, but is limited in its measuring direction, which if fixed only along the z-axis. A Designed fixture of new shape to supplement these problems in this paper. The new fixture using several joints and an tooling ball holder is designed considering the convenience of the part set-up and the accuracy of the registration. The location of the tooling balls can be arranged to avoid the occlusion of the part and to minimize the registration error. The new fixture is apply to an object part having freeform surfaces to verify the effectiveness of the proposed design.
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